The biological single cell research (e.g using the Paramecia) was able to demonstrate that we (theoretical) can live forever. But despite of this we must die – why? Yes, our body consist of billions of cells, has separate organs, is practicing a lot of specialized functions and the metabolic pathways are very complicated. But what is the limiting factor why we must die. When we compare this with other animals, we reach only rank five regarding life expectancy. Why?
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